Binary correlation coefficients (Yule 1912) between the detection rates of different molecules. The box on the bottom left describes the details of various numbers shown in each colored box on the right. The color denotes the value of the correlation coefficient, with red corresponding to an anticorrelation and blue corresponding to a correlation. For calculating the coefficients only firm detections are considered as “detected” while the rest (including tentative detections) are considered “undetected.” Molecules that are detected in all the sources or are detected in only one source are not shown. Molecule pairs with statistically significant correlations (p-value <0.05) are highlighted with black borders.